Databricks Certified Professional Data Scientist Exam - Topic 4 Question 30 Discussion

Actual exam question for Databricks's Databricks Certified Professional Data Scientist exam

Question #: 30
Topic #: 4

[All Databricks Certified Professional Data Scientist Questions]

Refer to the exhibit.

You are using K-means clustering to classify customer behavior for a large retailer. You need to determine the optimum number of customer groups. You plot the within-sum-of-squares (wss) data as shown in the exhibit. How many customer groups should you specify?

Show Suggested Answer

Suggested Answer: C

by Raina at Sep 16, 2022, 04:45 AM

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Maryanne

5 months ago

Not sure about this... 8 seems like too many groups to me.

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Evangelina

5 months ago

Definitely 3, the drop in wss is clear there.

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Brynn

5 months ago

Wait, why is everyone saying 3? I thought 2 was enough!

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Raina

5 months ago

I think 4 might actually be better for more granularity.

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Cathrine

5 months ago

Looks like 3 is the sweet spot based on the elbow method!

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Trina

6 months ago

I’m leaning towards option B, but I’m not 100% confident. I wish I had more practice with interpreting these types of plots.

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Rhea

6 months ago

I feel like 4 groups might be too many, but I can't quite remember how to justify that. The graph looks like it flattens out around 3, right?

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Markus

6 months ago

I think we practiced a similar question where we had to choose the number of clusters based on the wss graph. If I recall correctly, the optimal number is where the decrease in wss starts to level off.

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Kristin

6 months ago

I remember we discussed the elbow method in class, but I'm not entirely sure how to identify the elbow point in this plot.

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Stefanie

6 months ago

I'm a little confused on this one. I thought the Scrum Daily Meeting could be held at different times, as long as it's consistent. Is there a specific "most encouraged" time? I'll have to review my notes.

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Willis

6 months ago

This is a tricky one. The solution sounds good, but I'm not sure if it's a complete justification for choosing Okta. I'll need to consider other factors like security, scalability, and cost to determine if Okta is the best fit.

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